Unknown setter '_date_time' Carbon / Laravel 4 - laravel

I have my installation of laravel 4 under HHVM, and i set up as a accessory on my eloquent an converter date from SQL date to human.
doing something like that:
public function getDateSpanAttribute($value)
{
return $value = \Carbon\Carbon::createFromFormat('Y-m-d H:i:s',$this->created_at)->diffForHumans();
}
This method work well under php5, no error just work. On HHVM this accessory throw me an exception saying,
{"error":{"type":"InvalidArgumentException","message":"Unknown setter
'_date_time'","file":"/var/www/mynextmatch/vendor/nesbot/carbon/src/Carbon/Carbon.php","line":542}}
I saw the source of Carbon on that row and it is the magic method __get() to give this problem but i cannot figure out why it happening.
I will appreciate same help. Thanks

Not sure about the error on HHVM but one thing is for sure that an accessor method doesn't contain any argument, it should be (Manual):
public function getDateSpanAttribute()
{
return \Carbon\Carbon::createFromFormat('Y-m-d H:i:s', $this->created_at)->diffForHumans();
}
You just need to return the property not setting anything, if you want to set anything then it would be a setter/mutator method which acepts a value as argument.

I am having the same issue but think mine is tied to creating a session creation after logging in (
InvalidArgumentException Unknown setter '_date_time'). Mine is installed on HHVM 3.1 running on Ubuntu 14.04. I have the same set up using Ubuntu 12.04 and am not having this issue.
10. InvalidArgumentException
…/­vendor/­nesbot/­carbon/­src/­Carbon/­Carbon.php542
9. Carbon\Carbon __set
<#unknown>0
8. DateTime __sleep
<#unknown>0
7. serialize
…/­vendor/­laravel/­framework/­src/­Illuminate/­Session/­Store.php222
6. Illuminate\Session\Store save
…/­vendor/­laravel/­framework/­src/­Illuminate/­Session/­Middleware.php126

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